package com.example.educenter.controller;

import com.example.commonutils.JwtUtils;
import com.example.educenter.entity.UcenterMember;
import com.example.educenter.service.UcenterMemberService;
import com.example.educenter.utils.ConstantWxUtils;
import com.example.educenter.utils.HttpClientUtils;
import com.example.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author wlg
 * @create_time 2021-09-10 下午 20:24
 * @function
 */
@Controller
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
     private UcenterMemberService memberService;

    @GetMapping("callback")
    public String callback(String code,String state){

        try {

            //1、获取code（临时票据）值，类似于验证码

            //2、拿着code请求微信固定的地址，得到两个值access_token和openid
            //拿着code，去请求微信固定的地址，得到两个值 access_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token"+
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数：id 秘钥和code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_APP_ID,
                    ConstantWxUtils.WX_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址，得到两个返回值，access_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出两个值 access_token和openid
            //把accessTokenInfo字符串转换map集合,根据map里面key获取对应值
            //使用json转换工具 Gson
            Gson gson=new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token =(String) mapAccessToken.get("access_token");
            String openid =(String) mapAccessToken.get("openid");



            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同微信信息，根据openid判断
            UcenterMember member=memberService.getOpenIdMember(openid);
            if(member==null){

                //3、拿着得到access_token和openid，再去请求微信提供固定地址，获取到扫码人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送信息
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)userInfoMap.get("nickname");//昵称
                String headimgurl = (String)userInfoMap.get("headimgurl");//头像

                member=new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后：返回首页面，通过路径字符串传递token字符串

            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
         throw  new GuliException(20001,"登录失败，扫描失败");
        }

    }


    //1、生成微信扫码二维码
    @GetMapping("login")
    public String getWxcode(){
    //固定地址，后面拼接参数
        String baseUrl="https://open.weixin.qq.com/connect/qrconnect"
                +"?appid=%s"
                +"&redirect_uri=%s"
                +"&response_type=code"
                +"&scope=snsapi_login"
                +"&state=%s"
                +"#wechat_redirect";
        //对redirect_url进行URLEncode编码
       String redirectUrl=ConstantWxUtils.WX_REDIRECT_URL;
       // System.out.println("=====redirectUrl"+redirectUrl);
        try {
            redirectUrl= URLEncoder.encode(redirectUrl,"UTF-8");
           // System.out.println("==------redirectUrl"+redirectUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }

        //设置 %s 占位符的参数，上面有3处
        String url = String.format(baseUrl,
                ConstantWxUtils.WX_APP_ID,
                redirectUrl,
                "wang");

        //重定向到请求微信地址里面
        return "redirect:" + url;
    }

}
